
/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>


static char *ngx_http_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static ngx_int_t ngx_http_init_phases(ngx_conf_t *cf,
                                      ngx_http_core_main_conf_t *cmcf);
static ngx_int_t ngx_http_init_headers_in_hash(ngx_conf_t *cf,
                                               ngx_http_core_main_conf_t *cmcf);
static ngx_int_t ngx_http_init_phase_handlers(ngx_conf_t *cf,
                                              ngx_http_core_main_conf_t *cmcf);

static ngx_int_t ngx_http_add_addresses(ngx_conf_t *cf,
                                        ngx_http_core_srv_conf_t *cscf, ngx_http_conf_port_t *port,
                                        ngx_http_listen_opt_t *lsopt);
static ngx_int_t ngx_http_add_address(ngx_conf_t *cf,
                                      ngx_http_core_srv_conf_t *cscf, ngx_http_conf_port_t *port,
                                      ngx_http_listen_opt_t *lsopt);
static ngx_int_t ngx_http_add_server(ngx_conf_t *cf,
                                     ngx_http_core_srv_conf_t *cscf, ngx_http_conf_addr_t *addr);

static char *ngx_http_merge_servers(ngx_conf_t *cf,
                                    ngx_http_core_main_conf_t *cmcf, ngx_http_module_t *module,
                                    ngx_uint_t ctx_index);
static char *ngx_http_merge_locations(ngx_conf_t *cf,
                                      ngx_queue_t *locations, void **loc_conf, ngx_http_module_t *module,
                                      ngx_uint_t ctx_index);
static ngx_int_t ngx_http_init_locations(ngx_conf_t *cf,
                                         ngx_http_core_srv_conf_t *cscf, ngx_http_core_loc_conf_t *pclcf);
static ngx_int_t ngx_http_init_static_location_trees(ngx_conf_t *cf,
                                                     ngx_http_core_loc_conf_t *pclcf);
static ngx_int_t ngx_http_cmp_locations(const ngx_queue_t *one,
                                        const ngx_queue_t *two);
static ngx_int_t ngx_http_join_exact_locations(ngx_conf_t *cf,
                                               ngx_queue_t *locations);
static void ngx_http_create_locations_list(ngx_queue_t *locations,
                                           ngx_queue_t *q);
static ngx_http_location_tree_node_t *
ngx_http_create_locations_tree(ngx_conf_t *cf, ngx_queue_t *locations,
                               size_t prefix);

static ngx_int_t ngx_http_optimize_servers(ngx_conf_t *cf,
                                           ngx_http_core_main_conf_t *cmcf, ngx_array_t *ports);
static ngx_int_t ngx_http_server_names(ngx_conf_t *cf,
                                       ngx_http_core_main_conf_t *cmcf, ngx_http_conf_addr_t *addr);
static ngx_int_t ngx_http_cmp_conf_addrs(const void *one, const void *two);
static int ngx_libc_cdecl ngx_http_cmp_dns_wildcards(const void *one,
                                                     const void *two);

static ngx_int_t ngx_http_init_listening(ngx_conf_t *cf,
                                         ngx_http_conf_port_t *port);
static ngx_listening_t *ngx_http_add_listening(ngx_conf_t *cf,
                                               ngx_http_conf_addr_t *addr);
static ngx_int_t ngx_http_add_addrs(ngx_conf_t *cf, ngx_http_port_t *hport,
                                    ngx_http_conf_addr_t *addr);
#if (NGX_HAVE_INET6)
static ngx_int_t ngx_http_add_addrs6(ngx_conf_t *cf, ngx_http_port_t *hport,
                                     ngx_http_conf_addr_t *addr);
#endif

ngx_uint_t   ngx_http_max_module;


ngx_int_t  (*ngx_http_top_header_filter) (ngx_http_request_t *r);
ngx_int_t  (*ngx_http_top_body_filter) (ngx_http_request_t *r, ngx_chain_t *ch);


ngx_str_t  ngx_http_html_default_types[] = {
  ngx_string("text/html"),
  ngx_null_string
};


static ngx_command_t  ngx_http_commands[] = {

  { ngx_string("http"),
    NGX_MAIN_CONF|NGX_CONF_BLOCK|NGX_CONF_NOARGS,
    ngx_http_block,
    0,
    0,
    NULL },

  ngx_null_command
};


static ngx_core_module_t  ngx_http_module_ctx = {
  ngx_string("http"),
  NULL,
  NULL
};


ngx_module_t  ngx_http_module = {
  NGX_MODULE_V1,
  &ngx_http_module_ctx,                  /* module context */
  ngx_http_commands,                     /* module directives */
  NGX_CORE_MODULE,                       /* module type */
  NULL,                                  /* init master */
  NULL,                                  /* init module */
  NULL,                                  /* init process */
  NULL,                                  /* init thread */
  NULL,                                  /* exit thread */
  NULL,                                  /* exit process */
  NULL,                                  /* exit master */
  NGX_MODULE_V1_PADDING
};


static char *
ngx_http_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
  char                        *rv;
  ngx_uint_t                   mi, m, s;
  ngx_conf_t                   pcf;
  ngx_http_module_t           *module;
  ngx_http_conf_ctx_t         *ctx;
  ngx_http_core_loc_conf_t    *clcf;
  ngx_http_core_srv_conf_t   **cscfp;
  ngx_http_core_main_conf_t   *cmcf;

  /* the main http context */

  ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_conf_ctx_t));
  if (ctx == NULL) {
    return NGX_CONF_ERROR;
  }

  *(ngx_http_conf_ctx_t **) conf = ctx;


  /* count the number of the http modules and set up their indices */

  ngx_http_max_module = 0;
  for (m = 0; ngx_modules[m]; m++) {
    if (ngx_modules[m]->type != NGX_HTTP_MODULE) {
      continue;
    }

    ngx_modules[m]->ctx_index = ngx_http_max_module++;
  }


  /* the http main_conf context, it is the same in the all http contexts */

  ctx->main_conf = ngx_pcalloc(cf->pool,
                               sizeof(void *) * ngx_http_max_module);
  if (ctx->main_conf == NULL) {
    return NGX_CONF_ERROR;
  }


  /*
   * the http null srv_conf context, it is used to merge
   * the server{}s' srv_conf's
   */

  ctx->srv_conf = ngx_pcalloc(cf->pool, sizeof(void *) * ngx_http_max_module);
  if (ctx->srv_conf == NULL) {
    return NGX_CONF_ERROR;
  }


  /*
   * the http null loc_conf context, it is used to merge
   * the server{}s' loc_conf's
   */

  ctx->loc_conf = ngx_pcalloc(cf->pool, sizeof(void *) * ngx_http_max_module);
  if (ctx->loc_conf == NULL) {
    return NGX_CONF_ERROR;
  }


  /*
   * create the main_conf's, the null srv_conf's, and the null loc_conf's
   * of the all http modules
   */

  for (m = 0; ngx_modules[m]; m++) {
    if (ngx_modules[m]->type != NGX_HTTP_MODULE) {
      continue;
    }

    module = ngx_modules[m]->ctx;
    mi = ngx_modules[m]->ctx_index;

    if (module->create_main_conf) {
      ctx->main_conf[mi] = module->create_main_conf(cf);
      if (ctx->main_conf[mi] == NULL) {
        return NGX_CONF_ERROR;
      }
    }

    if (module->create_srv_conf) {
      ctx->srv_conf[mi] = module->create_srv_conf(cf);
      if (ctx->srv_conf[mi] == NULL) {
        return NGX_CONF_ERROR;
      }
    }

    if (module->create_loc_conf) {
      ctx->loc_conf[mi] = module->create_loc_conf(cf);
      if (ctx->loc_conf[mi] == NULL) {
        return NGX_CONF_ERROR;
      }
    }
  }

  pcf = *cf;
  cf->ctx = ctx;

  for (m = 0; ngx_modules[m]; m++) {
    if (ngx_modules[m]->type != NGX_HTTP_MODULE) {
      continue;
    }

    module = ngx_modules[m]->ctx;

    if (module->preconfiguration) {
      if (module->preconfiguration(cf) != NGX_OK) {
        return NGX_CONF_ERROR;
      }
    }
  }

  /* parse inside the http{} block */

  cf->module_type = NGX_HTTP_MODULE;
  cf->cmd_type = NGX_HTTP_MAIN_CONF;
  rv = ngx_conf_parse(cf, NULL);

  if (rv != NGX_CONF_OK) {
    goto failed;
  }

  /*
   * init http{} main_conf's, merge the server{}s' srv_conf's
   * and its location{}s' loc_conf's
   */

  cmcf = ctx->main_conf[ngx_http_core_module.ctx_index];
  cscfp = cmcf->servers.elts;

  for (m = 0; ngx_modules[m]; m++) {
    if (ngx_modules[m]->type != NGX_HTTP_MODULE) {
      continue;
    }

    module = ngx_modules[m]->ctx;
    mi = ngx_modules[m]->ctx_index;

    /* init http{} main_conf's */

    if (module->init_main_conf) {
      rv = module->init_main_conf(cf, ctx->main_conf[mi]);
      if (rv != NGX_CONF_OK) {
        goto failed;
      }
    }

    rv = ngx_http_merge_servers(cf, cmcf, module, mi);
    if (rv != NGX_CONF_OK) {
      goto failed;
    }
  }


  /* create location trees */

  for (s = 0; s < cmcf->servers.nelts; s++) {

    clcf = cscfp[s]->ctx->loc_conf[ngx_http_core_module.ctx_index];

    if (ngx_http_init_locations(cf, cscfp[s], clcf) != NGX_OK) {
      return NGX_CONF_ERROR;
    }

    if (ngx_http_init_static_location_trees(cf, clcf) != NGX_OK) {
      return NGX_CONF_ERROR;
    }
  }


  if (ngx_http_init_phases(cf, cmcf) != NGX_OK) {
    return NGX_CONF_ERROR;
  }

  if (ngx_http_init_headers_in_hash(cf, cmcf) != NGX_OK) {
    return NGX_CONF_ERROR;
  }


  for (m = 0; ngx_modules[m]; m++) {
    if (ngx_modules[m]->type != NGX_HTTP_MODULE) {
      continue;
    }

    module = ngx_modules[m]->ctx;

    if (module->postconfiguration) {
      if (module->postconfiguration(cf) != NGX_OK) {
        return NGX_CONF_ERROR;
      }
    }
  }

  if (ngx_http_variables_init_vars(cf) != NGX_OK) {
    return NGX_CONF_ERROR;
  }

  /*
   * http{}'s cf->ctx was needed while the configuration merging
   * and in postconfiguration process
   */

  *cf = pcf;


  if (ngx_http_init_phase_handlers(cf, cmcf) != NGX_OK) {
    return NGX_CONF_ERROR;
  }


  /* optimize the lists of ports, addresses and server names */

  if (ngx_http_optimize_servers(cf, cmcf, cmcf->ports) != NGX_OK) {
    return NGX_CONF_ERROR;
  }

  return NGX_CONF_OK;

failed:

  *cf = pcf;

  return rv;
}


static ngx_int_t
ngx_http_init_phases(ngx_conf_t *cf, ngx_http_core_main_conf_t *cmcf)
{
  if (ngx_array_init(&cmcf->phases[NGX_HTTP_POST_READ_PHASE].handlers,
                     cf->pool, 1, sizeof(ngx_http_handler_pt))
      != NGX_OK)
  {
    return NGX_ERROR;
  }

  if (ngx_array_init(&cmcf->phases[NGX_HTTP_SERVER_REWRITE_PHASE].handlers,
                     cf->pool, 1, sizeof(ngx_http_handler_pt))
      != NGX_OK)
  {
    return NGX_ERROR;
  }

  if (ngx_array_init(&cmcf->phases[NGX_HTTP_REWRITE_PHASE].handlers,
                     cf->pool, 1, sizeof(ngx_http_handler_pt))
      != NGX_OK)
  {
    return NGX_ERROR;
  }

  if (ngx_array_init(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers,
                     cf->pool, 1, sizeof(ngx_http_handler_pt))
      != NGX_OK)
  {
    return NGX_ERROR;
  }

  if (ngx_array_init(&cmcf->phases[NGX_HTTP_ACCESS_PHASE].handlers,
                     cf->pool, 2, sizeof(ngx_http_handler_pt))
      != NGX_OK)
  {
    return NGX_ERROR;
  }

  if (ngx_array_init(&cmcf->phases[NGX_HTTP_CONTENT_PHASE].handlers,
                     cf->pool, 4, sizeof(ngx_http_handler_pt))
      != NGX_OK)
  {
    return NGX_ERROR;
  }

  if (ngx_array_init(&cmcf->phases[NGX_HTTP_LOG_PHASE].handlers,
                     cf->pool, 1, sizeof(ngx_http_handler_pt))
      != NGX_OK)
  {
    return NGX_ERROR;
  }

  return NGX_OK;
}


static ngx_int_t
ngx_http_init_headers_in_hash(ngx_conf_t *cf, ngx_http_core_main_conf_t *cmcf)
{
  ngx_array_t         headers_in;
  ngx_hash_key_t     *hk;
  ngx_hash_init_t     hash;
  ngx_http_header_t  *header;

  if (ngx_array_init(&headers_in, cf->temp_pool, 32, sizeof(ngx_hash_key_t))
      != NGX_OK)
  {
    return NGX_ERROR;
  }

  for (header = ngx_http_headers_in; header->name.len; header++) {
    hk = ngx_array_push(&headers_in);
    if (hk == NULL) {
      return NGX_ERROR;
    }

    hk->key = header->name;
    hk->key_hash = ngx_hash_key_lc(header->name.data, header->name.len);
    hk->value = header;
  }

  hash.hash = &cmcf->headers_in_hash;
  hash.key = ngx_hash_key_lc;
  hash.max_size = 512;
  hash.bucket_size = ngx_align(64, ngx_cacheline_size);
  hash.name = "headers_in_hash";
  hash.pool = cf->pool;
  hash.temp_pool = NULL;

  if (ngx_hash_init(&hash, headers_in.elts, headers_in.nelts) != NGX_OK) {
    return NGX_ERROR;
  }

  return NGX_OK;
}


static ngx_int_t
ngx_http_init_phase_handlers(ngx_conf_t *cf, ngx_http_core_main_conf_t *cmcf)
{
  ngx_int_t                   j;
  ngx_uint_t                  i, n;
  ngx_uint_t                  find_config_index, use_rewrite, use_access;
  ngx_http_handler_pt        *h;
  ngx_http_phase_handler_t   *ph;
  ngx_http_phase_handler_pt   checker;

  cmcf->phase_engine.server_rewrite_index = (ngx_uint_t) -1;
  cmcf->phase_engine.location_rewrite_index = (ngx_uint_t) -1;
  find_config_index = 0;
  use_rewrite = cmcf->phases[NGX_HTTP_REWRITE_PHASE].handlers.nelts ? 1 : 0;
  use_access = cmcf->phases[NGX_HTTP_ACCESS_PHASE].handlers.nelts ? 1 : 0;

  n = use_rewrite + use_access + cmcf->try_files + 1 /* find config phase */;

  for (i = 0; i < NGX_HTTP_LOG_PHASE; i++) {
    n += cmcf->phases[i].handlers.nelts;
  }

  ph = ngx_pcalloc(cf->pool,
                   n * sizeof(ngx_http_phase_handler_t) + sizeof(void *));
  if (ph == NULL) {
    return NGX_ERROR;
  }

  cmcf->phase_engine.handlers = ph;
  n = 0;

  for (i = 0; i < NGX_HTTP_LOG_PHASE; i++) {
    h = cmcf->phases[i].handlers.elts;

    switch (i) {

      case NGX_HTTP_SERVER_REWRITE_PHASE:
        if (cmcf->phase_engine.server_rewrite_index == (ngx_uint_t) -1) {
          cmcf->phase_engine.server_rewrite_index = n;
        }
        checker = ngx_http_core_rewrite_phase;

        break;

      case NGX_HTTP_FIND_CONFIG_PHASE:
        find_config_index = n;

        ph->checker = ngx_http_core_find_config_phase;
        n++;
        ph++;

        continue;

      case NGX_HTTP_REWRITE_PHASE:
        if (cmcf->phase_engine.location_rewrite_index == (ngx_uint_t) -1) {
          cmcf->phase_engine.location_rewrite_index = n;
        }
        checker = ngx_http_core_rewrite_phase;

        break;

      case NGX_HTTP_POST_REWRITE_PHASE:
        if (use_rewrite) {
          ph->checker = ngx_http_core_post_rewrite_phase;
          ph->next = find_config_index;
          n++;
          ph++;
        }

        continue;

      case NGX_HTTP_ACCESS_PHASE:
        checker = ngx_http_core_access_phase;
        n++;
        break;

      case NGX_HTTP_POST_ACCESS_PHASE:
        if (use_access) {
          ph->checker = ngx_http_core_post_access_phase;
          ph->next = n;
          ph++;
        }

        continue;

      case NGX_HTTP_TRY_FILES_PHASE:
        if (cmcf->try_files) {
          ph->checker = ngx_http_core_try_files_phase;
          n++;
          ph++;
        }

        continue;

      case NGX_HTTP_CONTENT_PHASE:
        checker = ngx_http_core_content_phase;
        break;

      default:
        checker = ngx_http_core_generic_phase;
    }

    n += cmcf->phases[i].handlers.nelts;

    for (j = cmcf->phases[i].handlers.nelts - 1; j >=0; j--) {
      ph->checker = checker;
      ph->handler = h[j];
      ph->next = n;
      ph++;
    }
  }

  return NGX_OK;
}


static char *
ngx_http_merge_servers(ngx_conf_t *cf, ngx_http_core_main_conf_t *cmcf,
                       ngx_http_module_t *module, ngx_uint_t ctx_index)
{
  char                        *rv;
  ngx_uint_t                   s;
  ngx_http_conf_ctx_t         *ctx, saved;
  ngx_http_core_loc_conf_t    *clcf;
  ngx_http_core_srv_conf_t   **cscfp;

  cscfp = cmcf->servers.elts;
  ctx = (ngx_http_conf_ctx_t *) cf->ctx;
  saved = *ctx;
  rv = NGX_CONF_OK;

  for (s = 0; s < cmcf->servers.nelts; s++) {

    /* merge the server{}s' srv_conf's */

    ctx->srv_conf = cscfp[s]->ctx->srv_conf;

    if (module->merge_srv_conf) {
      rv = module->merge_srv_conf(cf, saved.srv_conf[ctx_index],
                                  cscfp[s]->ctx->srv_conf[ctx_index]);
      if (rv != NGX_CONF_OK) {
        goto failed;
      }
    }

    if (module->merge_loc_conf) {

      /* merge the server{}'s loc_conf */

      ctx->loc_conf = cscfp[s]->ctx->loc_conf;

      rv = module->merge_loc_conf(cf, saved.loc_conf[ctx_index],
                                  cscfp[s]->ctx->loc_conf[ctx_index]);
      if (rv != NGX_CONF_OK) {
        goto failed;
      }

      /* merge the locations{}' loc_conf's */

      clcf = cscfp[s]->ctx->loc_conf[ngx_http_core_module.ctx_index];

      rv = ngx_http_merge_locations(cf, clcf->locations,
                                    cscfp[s]->ctx->loc_conf,
                                    module, ctx_index);
      if (rv != NGX_CONF_OK) {
        goto failed;
      }
    }
  }

failed:

  *ctx = saved;

  return rv;
}


static char *
ngx_http_merge_locations(ngx_conf_t *cf, ngx_queue_t *locations,
                         void **loc_conf, ngx_http_module_t *module, ngx_uint_t ctx_index)
{
  char                       *rv;
  ngx_queue_t                *q;
  ngx_http_conf_ctx_t        *ctx, saved;
  ngx_http_core_loc_conf_t   *clcf;
  ngx_http_location_queue_t  *lq;

  if (locations == NULL) {
    return NGX_CONF_OK;
  }

  ctx = (ngx_http_conf_ctx_t *) cf->ctx;
  saved = *ctx;

  for (q = ngx_queue_head(locations);
       q != ngx_queue_sentinel(locations);
       q = ngx_queue_next(q))
  {
    lq = (ngx_http_location_queue_t *) q;

    clcf = lq->exact ? lq->exact : lq->inclusive;
    ctx->loc_conf = clcf->loc_conf;

    rv = module->merge_loc_conf(cf, loc_conf[ctx_index],
                                clcf->loc_conf[ctx_index]);
    if (rv != NGX_CONF_OK) {
      return rv;
    }

    rv = ngx_http_merge_locations(cf, clcf->locations, clcf->loc_conf,
                                  module, ctx_index);
    if (rv != NGX_CONF_OK) {
      return rv;
    }
  }

  *ctx = saved;

  return NGX_CONF_OK;
}


static ngx_int_t
ngx_http_init_locations(ngx_conf_t *cf, ngx_http_core_srv_conf_t *cscf,
                        ngx_http_core_loc_conf_t *pclcf)
{
  ngx_uint_t                   n;
  ngx_queue_t                 *q, *locations, *named, tail;
  ngx_http_core_loc_conf_t    *clcf;
  ngx_http_location_queue_t   *lq;
  ngx_http_core_loc_conf_t   **clcfp;
#if (NGX_PCRE)
  ngx_uint_t                   r;
  ngx_queue_t                 *regex;
#endif

  locations = pclcf->locations;

  if (locations == NULL) {
    return NGX_OK;
  }

  ngx_queue_sort(locations, ngx_http_cmp_locations);

  named = NULL;
  n = 0;
#if (NGX_PCRE)
  regex = NULL;
  r = 0;
#endif

  for (q = ngx_queue_head(locations);
       q != ngx_queue_sentinel(locations);
       q = ngx_queue_next(q))
  {
    lq = (ngx_http_location_queue_t *) q;

    clcf = lq->exact ? lq->exact : lq->inclusive;

    if (ngx_http_init_locations(cf, NULL, clcf) != NGX_OK) {
      return NGX_ERROR;
    }

#if (NGX_PCRE)

    if (clcf->regex) {
      r++;

      if (regex == NULL) {
        regex = q;
      }

      continue;
    }

#endif

    if (clcf->named) {
      n++;

      if (named == NULL) {
        named = q;
      }

      continue;
    }

    if (clcf->noname) {
      break;
    }
  }

  if (q != ngx_queue_sentinel(locations)) {
    ngx_queue_split(locations, q, &tail);
  }

  if (named) {
    clcfp = ngx_palloc(cf->pool,
                       (n + 1) * sizeof(ngx_http_core_loc_conf_t **));
    if (clcfp == NULL) {
      return NGX_ERROR;
    }

    cscf->named_locations = clcfp;

    for (q = named;
         q != ngx_queue_sentinel(locations);
         q = ngx_queue_next(q))
    {
      lq = (ngx_http_location_queue_t *) q;

      *(clcfp++) = lq->exact;
    }

    *clcfp = NULL;

    ngx_queue_split(locations, named, &tail);
  }

#if (NGX_PCRE)

  if (regex) {

    clcfp = ngx_palloc(cf->pool,
                       (r + 1) * sizeof(ngx_http_core_loc_conf_t **));
    if (clcfp == NULL) {
      return NGX_ERROR;
    }

    pclcf->regex_locations = clcfp;

    for (q = regex;
         q != ngx_queue_sentinel(locations);
         q = ngx_queue_next(q))
    {
      lq = (ngx_http_location_queue_t *) q;

      *(clcfp++) = lq->exact;
    }

    *clcfp = NULL;

    ngx_queue_split(locations, regex, &tail);
  }

#endif

  return NGX_OK;
}


static ngx_int_t
ngx_http_init_static_location_trees(ngx_conf_t *cf,
                                    ngx_http_core_loc_conf_t *pclcf)
{
  ngx_queue_t                *q, *locations;
  ngx_http_core_loc_conf_t   *clcf;
  ngx_http_location_queue_t  *lq;

  locations = pclcf->locations;

  if (locations == NULL) {
    return NGX_OK;
  }

  if (ngx_queue_empty(locations)) {
    return NGX_OK;
  }

  for (q = ngx_queue_head(locations);
       q != ngx_queue_sentinel(locations);
       q = ngx_queue_next(q))
  {
    lq = (ngx_http_location_queue_t *) q;

    clcf = lq->exact ? lq->exact : lq->inclusive;

    if (ngx_http_init_static_location_trees(cf, clcf) != NGX_OK) {
      return NGX_ERROR;
    }
  }

  if (ngx_http_join_exact_locations(cf, locations) != NGX_OK) {
    return NGX_ERROR;
  }

  ngx_http_create_locations_list(locations, ngx_queue_head(locations));

  pclcf->static_locations = ngx_http_create_locations_tree(cf, locations, 0);
  if (pclcf->static_locations == NULL) {
    return NGX_ERROR;
  }

  return NGX_OK;
}


ngx_int_t
ngx_http_add_location(ngx_conf_t *cf, ngx_queue_t **locations,
                      ngx_http_core_loc_conf_t *clcf)
{
  ngx_http_location_queue_t  *lq;

  if (*locations == NULL) {
    *locations = ngx_palloc(cf->temp_pool,
                            sizeof(ngx_http_location_queue_t));
    if (*locations == NULL) {
      return NGX_ERROR;
    }

    ngx_queue_init(*locations);
  }

  lq = ngx_palloc(cf->temp_pool, sizeof(ngx_http_location_queue_t));
  if (lq == NULL) {
    return NGX_ERROR;
  }

  if (clcf->exact_match
#if (NGX_PCRE)
      || clcf->regex
#endif
      || clcf->named || clcf->noname)
  {
    lq->exact = clcf;
    lq->inclusive = NULL;

  } else {
    lq->exact = NULL;
    lq->inclusive = clcf;
  }

  lq->name = &clcf->name;
  lq->file_name = cf->conf_file->file.name.data;
  lq->line = cf->conf_file->line;

  ngx_queue_init(&lq->list);

  ngx_queue_insert_tail(*locations, &lq->queue);

  return NGX_OK;
}


static ngx_int_t
ngx_http_cmp_locations(const ngx_queue_t *one, const ngx_queue_t *two)
{
  ngx_int_t                   rc;
  ngx_http_core_loc_conf_t   *first, *second;
  ngx_http_location_queue_t  *lq1, *lq2;

  lq1 = (ngx_http_location_queue_t *) one;
  lq2 = (ngx_http_location_queue_t *) two;

  first = lq1->exact ? lq1->exact : lq1->inclusive;
  second = lq2->exact ? lq2->exact : lq2->inclusive;

  if (first->noname && !second->noname) {
    /* shift no named locations to the end */
    return 1;
  }

  if (!first->noname && second->noname) {
    /* shift no named locations to the end */
    return -1;
  }

  if (first->noname || second->noname) {
    /* do not sort no named locations */
    return 0;
  }

  if (first->named && !second->named) {
    /* shift named locations to the end */
    return 1;
  }

  if (!first->named && second->named) {
    /* shift named locations to the end */
    return -1;
  }

  if (first->named && second->named) {
    return ngx_strcmp(first->name.data, second->name.data);
  }

#if (NGX_PCRE)

  if (first->regex && !second->regex) {
    /* shift the regex matches to the end */
    return 1;
  }

  if (!first->regex && second->regex) {
    /* shift the regex matches to the end */
    return -1;
  }

  if (first->regex || second->regex) {
    /* do not sort the regex matches */
    return 0;
  }

#endif

  rc = ngx_strcmp(first->name.data, second->name.data);

  if (rc == 0 && !first->exact_match && second->exact_match) {
    /* an exact match must be before the same inclusive one */
    return 1;
  }

  return rc;
}


static ngx_int_t
ngx_http_join_exact_locations(ngx_conf_t *cf, ngx_queue_t *locations)
{
  ngx_queue_t                *q, *x;
  ngx_http_location_queue_t  *lq, *lx;

  q = ngx_queue_head(locations);

  while (q != ngx_queue_last(locations)) {

    x = ngx_queue_next(q);

    lq = (ngx_http_location_queue_t *) q;
    lx = (ngx_http_location_queue_t *) x;

    if (ngx_strcmp(lq->name->data, lx->name->data) == 0) {

      if ((lq->exact && lx->exact) || (lq->inclusive && lx->inclusive)) {
        ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
                      "duplicate location \"%V\" in %s:%ui",
                      lx->name, lx->file_name, lx->line);

        return NGX_ERROR;
      }

      lq->inclusive = lx->inclusive;

      ngx_queue_remove(x);

      continue;
    }

    q = ngx_queue_next(q);
  }

  return NGX_OK;
}


static void
ngx_http_create_locations_list(ngx_queue_t *locations, ngx_queue_t *q)
{
  u_char                     *name;
  size_t                      len;
  ngx_queue_t                *x, tail;
  ngx_http_location_queue_t  *lq, *lx;

  if (q == ngx_queue_last(locations)) {
    return;
  }

  lq = (ngx_http_location_queue_t *) q;

  if (lq->inclusive == NULL) {
    ngx_http_create_locations_list(locations, ngx_queue_next(q));
    return;
  }

  len = lq->name->len;
  name = lq->name->data;

  for (x = ngx_queue_next(q);
       x != ngx_queue_sentinel(locations);
       x = ngx_queue_next(x))
  {
    lx = (ngx_http_location_queue_t *) x;

    if (len > lx->name->len
        || (ngx_strncmp(name, lx->name->data, len) != 0))
    {
      break;
    }
  }

  q = ngx_queue_next(q);

  if (q == x) {
    ngx_http_create_locations_list(locations, x);
    return;
  }

  ngx_queue_split(locations, q, &tail);
  ngx_queue_add(&lq->list, &tail);

  if (x == ngx_queue_sentinel(locations)) {
    ngx_http_create_locations_list(&lq->list, ngx_queue_head(&lq->list));
    return;
  }

  ngx_queue_split(&lq->list, x, &tail);
  ngx_queue_add(locations, &tail);

  ngx_http_create_locations_list(&lq->list, ngx_queue_head(&lq->list));

  ngx_http_create_locations_list(locations, x);
}


/*
 * to keep cache locality for left leaf nodes, allocate nodes in following
 * order: node, left subtree, right subtree, inclusive subtree
 */

static ngx_http_location_tree_node_t *
ngx_http_create_locations_tree(ngx_conf_t *cf, ngx_queue_t *locations,
                               size_t prefix)
{
  size_t                          len;
  ngx_queue_t                    *q, tail;
  ngx_http_location_queue_t      *lq;
  ngx_http_location_tree_node_t  *node;

  q = ngx_queue_middle(locations);

  lq = (ngx_http_location_queue_t *) q;
  len = lq->name->len - prefix;

  node = ngx_palloc(cf->pool,
                    offsetof(ngx_http_location_tree_node_t, name) + len);
  if (node == NULL) {
    return NULL;
  }

  node->left = NULL;
  node->right = NULL;
  node->tree = NULL;
  node->exact = lq->exact;
  node->inclusive = lq->inclusive;

  node->auto_redirect = (u_char) ((lq->exact && lq->exact->auto_redirect)
                                  || (lq->inclusive && lq->inclusive->auto_redirect));

  node->len = (u_char) len;
  ngx_memcpy(node->name, &lq->name->data[prefix], len);

  ngx_queue_split(locations, q, &tail);

  if (ngx_queue_empty(locations)) {
    /*
     * ngx_queue_split() insures that if left part is empty,
     * then right one is empty too
     */
    goto inclusive;
  }

  node->left = ngx_http_create_locations_tree(cf, locations, prefix);
  if (node->left == NULL) {
    return NULL;
  }

  ngx_queue_remove(q);

  if (ngx_queue_empty(&tail)) {
    goto inclusive;
  }

  node->right = ngx_http_create_locations_tree(cf, &tail, prefix);
  if (node->right == NULL) {
    return NULL;
  }

inclusive:

  if (ngx_queue_empty(&lq->list)) {
    return node;
  }

  node->tree = ngx_http_create_locations_tree(cf, &lq->list, prefix + len);
  if (node->tree == NULL) {
    return NULL;
  }

  return node;
}


ngx_int_t
ngx_http_add_listen(ngx_conf_t *cf, ngx_http_core_srv_conf_t *cscf,
                    ngx_http_listen_opt_t *lsopt)
{
  in_port_t                   p;
  ngx_uint_t                  i;
  struct sockaddr            *sa;
  struct sockaddr_in         *sin;
  ngx_http_conf_port_t       *port;
  ngx_http_core_main_conf_t  *cmcf;
#if (NGX_HAVE_INET6)
  struct sockaddr_in6        *sin6;
#endif

  cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);

  if (cmcf->ports == NULL) {
    cmcf->ports = ngx_array_create(cf->temp_pool, 2,
                                   sizeof(ngx_http_conf_port_t));
    if (cmcf->ports == NULL) {
      return NGX_ERROR;
    }
  }

  sa = &lsopt->u.sockaddr;

  switch (sa->sa_family) {

#if (NGX_HAVE_INET6)
    case AF_INET6:
      sin6 = &lsopt->u.sockaddr_in6;
      p = sin6->sin6_port;
      break;
#endif

#if (NGX_HAVE_UNIX_DOMAIN)
    case AF_UNIX:
      p = 0;
      break;
#endif

    default: /* AF_INET */
      sin = &lsopt->u.sockaddr_in;
      p = sin->sin_port;
      break;
  }

  port = cmcf->ports->elts;
  for (i = 0; i < cmcf->ports->nelts; i++) {

    if (p != port[i].port || sa->sa_family != port[i].family) {
      continue;
    }

    /* a port is already in the port list */

    return ngx_http_add_addresses(cf, cscf, &port[i], lsopt);
  }

  /* add a port to the port list */

  port = ngx_array_push(cmcf->ports);
  if (port == NULL) {
    return NGX_ERROR;
  }

  port->family = sa->sa_family;
  port->port = p;
  port->addrs.elts = NULL;

  return ngx_http_add_address(cf, cscf, port, lsopt);
}


static ngx_int_t
ngx_http_add_addresses(ngx_conf_t *cf, ngx_http_core_srv_conf_t *cscf,
                       ngx_http_conf_port_t *port, ngx_http_listen_opt_t *lsopt)
{
  u_char                *p;
  size_t                 len, off;
  ngx_uint_t             i, default_server;
  struct sockaddr       *sa;
  ngx_http_conf_addr_t  *addr;
#if (NGX_HAVE_UNIX_DOMAIN)
  struct sockaddr_un    *saun;
#endif
#if (NGX_HTTP_SSL)
  ngx_uint_t             ssl;
#endif

  /*
   * we cannot compare whole sockaddr struct's as kernel
   * may fill some fields in inherited sockaddr struct's
   */

  sa = &lsopt->u.sockaddr;

  switch (sa->sa_family) {

#if (NGX_HAVE_INET6)
    case AF_INET6:
      off = offsetof(struct sockaddr_in6, sin6_addr);
      len = 16;
      break;
#endif

#if (NGX_HAVE_UNIX_DOMAIN)
    case AF_UNIX:
      off = offsetof(struct sockaddr_un, sun_path);
      len = sizeof(saun->sun_path);
      break;
#endif

    default: /* AF_INET */
      off = offsetof(struct sockaddr_in, sin_addr);
      len = 4;
      break;
  }

  p = lsopt->u.sockaddr_data + off;

  addr = port->addrs.elts;

  for (i = 0; i < port->addrs.nelts; i++) {

    if (ngx_memcmp(p, addr[i].opt.u.sockaddr_data + off, len) != 0) {
      continue;
    }

    /* the address is already in the address list */

    if (ngx_http_add_server(cf, cscf, &addr[i]) != NGX_OK) {
      return NGX_ERROR;
    }

    /* preserve default_server bit during listen options overwriting */
    default_server = addr[i].opt.default_server;

#if (NGX_HTTP_SSL)
    ssl = lsopt->ssl || addr[i].opt.ssl;
#endif

    if (lsopt->set) {

      if (addr[i].opt.set) {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                           "duplicate listen options for %s", addr[i].opt.addr);
        return NGX_ERROR;
      }

      addr[i].opt = *lsopt;
    }

    /* check the duplicate "default" server for this address:port */

    if (lsopt->default_server) {

      if (default_server) {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                           "a duplicate default server for %s", addr[i].opt.addr);
        return NGX_ERROR;
      }

      default_server = 1;
      addr[i].default_server = cscf;
    }

    addr[i].opt.default_server = default_server;
#if (NGX_HTTP_SSL)
    addr[i].opt.ssl = ssl;
#endif

    return NGX_OK;
  }

  /* add the address to the addresses list that bound to this port */

  return ngx_http_add_address(cf, cscf, port, lsopt);
}


/*
 * add the server address, the server names and the server core module
 * configurations to the port list
 */

static ngx_int_t
ngx_http_add_address(ngx_conf_t *cf, ngx_http_core_srv_conf_t *cscf,
                     ngx_http_conf_port_t *port, ngx_http_listen_opt_t *lsopt)
{
  ngx_http_conf_addr_t  *addr;

  if (port->addrs.elts == NULL) {
    if (ngx_array_init(&port->addrs, cf->temp_pool, 4,
                       sizeof(ngx_http_conf_addr_t))
        != NGX_OK)
    {
      return NGX_ERROR;
    }
  }

  addr = ngx_array_push(&port->addrs);
  if (addr == NULL) {
    return NGX_ERROR;
  }

  addr->opt = *lsopt;
  addr->hash.buckets = NULL;
  addr->hash.size = 0;
  addr->wc_head = NULL;
  addr->wc_tail = NULL;
#if (NGX_PCRE)
  addr->nregex = 0;
  addr->regex = NULL;
#endif
  addr->default_server = cscf;
  addr->servers.elts = NULL;

  return ngx_http_add_server(cf, cscf, addr);
}


/* add the server core module configuration to the address:port */

static ngx_int_t
ngx_http_add_server(ngx_conf_t *cf, ngx_http_core_srv_conf_t *cscf,
                    ngx_http_conf_addr_t *addr)
{
  ngx_uint_t                  i;
  ngx_http_core_srv_conf_t  **server;

  if (addr->servers.elts == NULL) {
    if (ngx_array_init(&addr->servers, cf->temp_pool, 4,
                       sizeof(ngx_http_core_srv_conf_t *))
        != NGX_OK)
    {
      return NGX_ERROR;
    }

  } else {
    server = addr->servers.elts;
    for (i = 0; i < addr->servers.nelts; i++) {
      if (server[i] == cscf) {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                           "a duplicate listen %s", addr->opt.addr);
        return NGX_ERROR;
      }
    }
  }

  server = ngx_array_push(&addr->servers);
  if (server == NULL) {
    return NGX_ERROR;
  }

  *server = cscf;

  return NGX_OK;
}


static ngx_int_t
ngx_http_optimize_servers(ngx_conf_t *cf, ngx_http_core_main_conf_t *cmcf,
                          ngx_array_t *ports)
{
  ngx_uint_t             p, a;
  ngx_http_conf_port_t  *port;
  ngx_http_conf_addr_t  *addr;

  if (ports == NULL) {
    return NGX_OK;
  }

  port = ports->elts;
  for (p = 0; p < ports->nelts; p++) {

    ngx_sort(port[p].addrs.elts, (size_t) port[p].addrs.nelts,
             sizeof(ngx_http_conf_addr_t), ngx_http_cmp_conf_addrs);

    /*
     * check whether all name-based servers have the same
     * configuraiton as a default server for given address:port
     */

    addr = port[p].addrs.elts;
    for (a = 0; a < port[p].addrs.nelts; a++) {

      if (addr[a].servers.nelts > 1
#if (NGX_PCRE)
          || addr[a].default_server->captures
#endif
          )
      {
        if (ngx_http_server_names(cf, cmcf, &addr[a]) != NGX_OK) {
          return NGX_ERROR;
        }
      }
    }

    if (ngx_http_init_listening(cf, &port[p]) != NGX_OK) {
      return NGX_ERROR;
    }
  }

  return NGX_OK;
}


static ngx_int_t
ngx_http_server_names(ngx_conf_t *cf, ngx_http_core_main_conf_t *cmcf,
                      ngx_http_conf_addr_t *addr)
{
  ngx_int_t                   rc;
  ngx_uint_t                  n, s;
  ngx_hash_init_t             hash;
  ngx_hash_keys_arrays_t      ha;
  ngx_http_server_name_t     *name;
  ngx_http_core_srv_conf_t  **cscfp;
#if (NGX_PCRE)
  ngx_uint_t                  regex, i;

  regex = 0;
#endif

  ngx_memzero(&ha, sizeof(ngx_hash_keys_arrays_t));

  ha.temp_pool = ngx_create_pool(16384, cf->log);
  if (ha.temp_pool == NULL) {
    return NGX_ERROR;
  }

  ha.pool = cf->pool;

  if (ngx_hash_keys_array_init(&ha, NGX_HASH_LARGE) != NGX_OK) {
    goto failed;
  }

  cscfp = addr->servers.elts;

  for (s = 0; s < addr->servers.nelts; s++) {

    name = cscfp[s]->server_names.elts;

    for (n = 0; n < cscfp[s]->server_names.nelts; n++) {

#if (NGX_PCRE)
      if (name[n].regex) {
        regex++;
        continue;
      }
#endif

      rc = ngx_hash_add_key(&ha, &name[n].name, name[n].server,
                            NGX_HASH_WILDCARD_KEY);

      if (rc == NGX_ERROR) {
        return NGX_ERROR;
      }

      if (rc == NGX_DECLINED) {
        ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
                      "invalid server name or wildcard \"%V\" on %s",
                      &name[n].name, addr->opt.addr);
        return NGX_ERROR;
      }

      if (rc == NGX_BUSY) {
        ngx_log_error(NGX_LOG_WARN, cf->log, 0,
                      "conflicting server name \"%V\" on %s, ignored",
                      &name[n].name, addr->opt.addr);
      }
    }
  }

  hash.key = ngx_hash_key_lc;
  hash.max_size = cmcf->server_names_hash_max_size;
  hash.bucket_size = cmcf->server_names_hash_bucket_size;
  hash.name = "server_names_hash";
  hash.pool = cf->pool;

  if (ha.keys.nelts) {
    hash.hash = &addr->hash;
    hash.temp_pool = NULL;

    if (ngx_hash_init(&hash, ha.keys.elts, ha.keys.nelts) != NGX_OK) {
      goto failed;
    }
  }

  if (ha.dns_wc_head.nelts) {

    ngx_qsort(ha.dns_wc_head.elts, (size_t) ha.dns_wc_head.nelts,
              sizeof(ngx_hash_key_t), ngx_http_cmp_dns_wildcards);

    hash.hash = NULL;
    hash.temp_pool = ha.temp_pool;

    if (ngx_hash_wildcard_init(&hash, ha.dns_wc_head.elts,
                               ha.dns_wc_head.nelts)
        != NGX_OK)
    {
      goto failed;
    }

    addr->wc_head = (ngx_hash_wildcard_t *) hash.hash;
  }

  if (ha.dns_wc_tail.nelts) {

    ngx_qsort(ha.dns_wc_tail.elts, (size_t) ha.dns_wc_tail.nelts,
              sizeof(ngx_hash_key_t), ngx_http_cmp_dns_wildcards);

    hash.hash = NULL;
    hash.temp_pool = ha.temp_pool;

    if (ngx_hash_wildcard_init(&hash, ha.dns_wc_tail.elts,
                               ha.dns_wc_tail.nelts)
        != NGX_OK)
    {
      goto failed;
    }

    addr->wc_tail = (ngx_hash_wildcard_t *) hash.hash;
  }

  ngx_destroy_pool(ha.temp_pool);

#if (NGX_PCRE)

  if (regex == 0) {
    return NGX_OK;
  }

  addr->nregex = regex;
  addr->regex = ngx_palloc(cf->pool, regex * sizeof(ngx_http_server_name_t));
  if (addr->regex == NULL) {
    return NGX_ERROR;
  }

  i = 0;

  for (s = 0; s < addr->servers.nelts; s++) {

    name = cscfp[s]->server_names.elts;

    for (n = 0; n < cscfp[s]->server_names.nelts; n++) {
      if (name[n].regex) {
        addr->regex[i++] = name[n];
      }
    }
  }

#endif

  return NGX_OK;

failed:

  ngx_destroy_pool(ha.temp_pool);

  return NGX_ERROR;
}


static ngx_int_t
ngx_http_cmp_conf_addrs(const void *one, const void *two)
{
  ngx_http_conf_addr_t  *first, *second;

  first = (ngx_http_conf_addr_t *) one;
  second = (ngx_http_conf_addr_t *) two;

  if (first->opt.wildcard) {
    /* a wildcard address must be the last resort, shift it to the end */
    return 1;
  }

  if (first->opt.bind && !second->opt.bind) {
    /* shift explicit bind()ed addresses to the start */
    return -1;
  }

  if (!first->opt.bind && second->opt.bind) {
    /* shift explicit bind()ed addresses to the start */
    return 1;
  }

  /* do not sort by default */

  return 0;
}


static int ngx_libc_cdecl
ngx_http_cmp_dns_wildcards(const void *one, const void *two)
{
  ngx_hash_key_t  *first, *second;

  first = (ngx_hash_key_t *) one;
  second = (ngx_hash_key_t *) two;

  return ngx_dns_strcmp(first->key.data, second->key.data);
}


static ngx_int_t
ngx_http_init_listening(ngx_conf_t *cf, ngx_http_conf_port_t *port)
{
  ngx_uint_t                 i, last, bind_wildcard;
  ngx_listening_t           *ls;
  ngx_http_port_t           *hport;
  ngx_http_conf_addr_t      *addr;

  addr = port->addrs.elts;
  last = port->addrs.nelts;

  /*
   * If there is a binding to an "*:port" then we need to bind() to
   * the "*:port" only and ignore other implicit bindings.  The bindings
   * have been already sorted: explicit bindings are on the start, then
   * implicit bindings go, and wildcard binding is in the end.
   */

  if (addr[last - 1].opt.wildcard) {
    addr[last - 1].opt.bind = 1;
    bind_wildcard = 1;

  } else {
    bind_wildcard = 0;
  }

  i = 0;

  while (i < last) {

    if (bind_wildcard && !addr[i].opt.bind) {
      i++;
      continue;
    }

    ls = ngx_http_add_listening(cf, &addr[i]);
    if (ls == NULL) {
      return NGX_ERROR;
    }

    hport = ngx_pcalloc(cf->pool, sizeof(ngx_http_port_t));
    if (hport == NULL) {
      return NGX_ERROR;
    }

    ls->servers = hport;

    if (i == last - 1) {
      hport->naddrs = last;

    } else {
      hport->naddrs = 1;
      i = 0;
    }

    switch (ls->sockaddr->sa_family) {

#if (NGX_HAVE_INET6)
      case AF_INET6:
        if (ngx_http_add_addrs6(cf, hport, addr) != NGX_OK) {
          return NGX_ERROR;
        }
        break;
#endif
      default: /* AF_INET */
        if (ngx_http_add_addrs(cf, hport, addr) != NGX_OK) {
          return NGX_ERROR;
        }
        break;
    }

    addr++;
    last--;
  }

  return NGX_OK;
}


static ngx_listening_t *
ngx_http_add_listening(ngx_conf_t *cf, ngx_http_conf_addr_t *addr)
{
  ngx_listening_t           *ls;
  ngx_http_core_loc_conf_t  *clcf;
  ngx_http_core_srv_conf_t  *cscf;

  ls = ngx_create_listening(cf, &addr->opt.u.sockaddr, addr->opt.socklen);
  if (ls == NULL) {
    return NULL;
  }

  ls->addr_ntop = 1;

  ls->handler = ngx_http_init_connection;

  cscf = addr->default_server;
  ls->pool_size = cscf->connection_pool_size;
  ls->post_accept_timeout = cscf->client_header_timeout;

  clcf = cscf->ctx->loc_conf[ngx_http_core_module.ctx_index];

  ls->logp = clcf->error_log;
  ls->log.data = &ls->addr_text;
  ls->log.handler = ngx_accept_log_error;

#if (NGX_WIN32)
  {
    ngx_iocp_conf_t  *iocpcf = NULL;

    if (ngx_get_conf(cf->cycle->conf_ctx, ngx_events_module)) {
      iocpcf = ngx_event_get_conf(cf->cycle->conf_ctx, ngx_iocp_module);
    }
    if (iocpcf && iocpcf->acceptex_read) {
      ls->post_accept_buffer_size = cscf->client_header_buffer_size;
    }
  }
#endif

  ls->backlog = addr->opt.backlog;
  ls->rcvbuf = addr->opt.rcvbuf;
  ls->sndbuf = addr->opt.sndbuf;

  ls->keepalive = addr->opt.so_keepalive;
#if (NGX_HAVE_KEEPALIVE_TUNABLE)
  ls->keepidle = addr->opt.tcp_keepidle;
  ls->keepintvl = addr->opt.tcp_keepintvl;
  ls->keepcnt = addr->opt.tcp_keepcnt;
#endif

#if (NGX_HAVE_DEFERRED_ACCEPT && defined SO_ACCEPTFILTER)
  ls->accept_filter = addr->opt.accept_filter;
#endif

#if (NGX_HAVE_DEFERRED_ACCEPT && defined TCP_DEFER_ACCEPT)
  ls->deferred_accept = addr->opt.deferred_accept;
#endif

#if (NGX_HAVE_INET6 && defined IPV6_V6ONLY)
  ls->ipv6only = addr->opt.ipv6only;
#endif

#if (NGX_HAVE_SETFIB)
  ls->setfib = addr->opt.setfib;
#endif

  return ls;
}


static ngx_int_t
ngx_http_add_addrs(ngx_conf_t *cf, ngx_http_port_t *hport,
                   ngx_http_conf_addr_t *addr)
{
  ngx_uint_t                 i;
  ngx_http_in_addr_t        *addrs;
  struct sockaddr_in        *sin;
  ngx_http_virtual_names_t  *vn;

  hport->addrs = ngx_pcalloc(cf->pool,
                             hport->naddrs * sizeof(ngx_http_in_addr_t));
  if (hport->addrs == NULL) {
    return NGX_ERROR;
  }

  addrs = hport->addrs;

  for (i = 0; i < hport->naddrs; i++) {

    sin = &addr[i].opt.u.sockaddr_in;
    addrs[i].addr = sin->sin_addr.s_addr;
    addrs[i].conf.default_server = addr[i].default_server;
#if (NGX_HTTP_SSL)
    addrs[i].conf.ssl = addr[i].opt.ssl;
#endif

    if (addr[i].hash.buckets == NULL
        && (addr[i].wc_head == NULL
            || addr[i].wc_head->hash.buckets == NULL)
        && (addr[i].wc_tail == NULL
            || addr[i].wc_tail->hash.buckets == NULL)
#if (NGX_PCRE)
        && addr[i].nregex == 0
#endif
        )
    {
      continue;
    }

    vn = ngx_palloc(cf->pool, sizeof(ngx_http_virtual_names_t));
    if (vn == NULL) {
      return NGX_ERROR;
    }

    addrs[i].conf.virtual_names = vn;

    vn->names.hash = addr[i].hash;
    vn->names.wc_head = addr[i].wc_head;
    vn->names.wc_tail = addr[i].wc_tail;
#if (NGX_PCRE)
    vn->nregex = addr[i].nregex;
    vn->regex = addr[i].regex;
#endif
  }

  return NGX_OK;
}


#if (NGX_HAVE_INET6)

static ngx_int_t
ngx_http_add_addrs6(ngx_conf_t *cf, ngx_http_port_t *hport,
                    ngx_http_conf_addr_t *addr)
{
  ngx_uint_t                 i;
  ngx_http_in6_addr_t       *addrs6;
  struct sockaddr_in6       *sin6;
  ngx_http_virtual_names_t  *vn;

  hport->addrs = ngx_pcalloc(cf->pool,
                             hport->naddrs * sizeof(ngx_http_in6_addr_t));
  if (hport->addrs == NULL) {
    return NGX_ERROR;
  }

  addrs6 = hport->addrs;

  for (i = 0; i < hport->naddrs; i++) {

    sin6 = &addr[i].opt.u.sockaddr_in6;
    addrs6[i].addr6 = sin6->sin6_addr;
    addrs6[i].conf.default_server = addr[i].default_server;
#if (NGX_HTTP_SSL)
    addrs6[i].conf.ssl = addr[i].opt.ssl;
#endif

    if (addr[i].hash.buckets == NULL
        && (addr[i].wc_head == NULL
            || addr[i].wc_head->hash.buckets == NULL)
        && (addr[i].wc_tail == NULL
            || addr[i].wc_tail->hash.buckets == NULL)
#if (NGX_PCRE)
        && addr[i].nregex == 0
#endif
        )
    {
      continue;
    }

    vn = ngx_palloc(cf->pool, sizeof(ngx_http_virtual_names_t));
    if (vn == NULL) {
      return NGX_ERROR;
    }

    addrs6[i].conf.virtual_names = vn;

    vn->names.hash = addr[i].hash;
    vn->names.wc_head = addr[i].wc_head;
    vn->names.wc_tail = addr[i].wc_tail;
#if (NGX_PCRE)
    vn->nregex = addr[i].nregex;
    vn->regex = addr[i].regex;
#endif
  }

  return NGX_OK;
}

#endif


char *
ngx_http_types_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
  char  *p = conf;

  ngx_array_t     **types;
  ngx_str_t        *value, *default_type;
  ngx_uint_t        i, n, hash;
  ngx_hash_key_t   *type;

  types = (ngx_array_t **) (p + cmd->offset);

  if (*types == (void *) -1) {
    return NGX_CONF_OK;
  }

  default_type = cmd->post;

  if (*types == NULL) {
    *types = ngx_array_create(cf->temp_pool, 1, sizeof(ngx_hash_key_t));
    if (*types == NULL) {
      return NGX_CONF_ERROR;
    }

    if (default_type) {
      type = ngx_array_push(*types);
      if (type == NULL) {
        return NGX_CONF_ERROR;
      }

      type->key = *default_type;
      type->key_hash = ngx_hash_key(default_type->data,
                                    default_type->len);
      type->value = (void *) 4;
    }
  }

  value = cf->args->elts;

  for (i = 1; i < cf->args->nelts; i++) {

    if (value[i].len == 1 && value[i].data[0] == '*') {
      *types = (void *) -1;
      return NGX_CONF_OK;
    }

    hash = ngx_hash_strlow(value[i].data, value[i].data, value[i].len);
    value[i].data[value[i].len] = '\0';

    type = (*types)->elts;
    for (n = 0; n < (*types)->nelts; n++) {

      if (ngx_strcmp(value[i].data, type[n].key.data) == 0) {
        ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
                           "duplicate MIME type \"%V\"", &value[i]);
        continue;
      }
    }

    type = ngx_array_push(*types);
    if (type == NULL) {
      return NGX_CONF_ERROR;
    }

    type->key = value[i];
    type->key_hash = hash;
    type->value = (void *) 4;
  }

  return NGX_CONF_OK;
}


char *
ngx_http_merge_types(ngx_conf_t *cf, ngx_array_t **keys, ngx_hash_t *types_hash,
                     ngx_array_t **prev_keys, ngx_hash_t *prev_types_hash,
                     ngx_str_t *default_types)
{
  ngx_hash_init_t  hash;

  if (*keys) {

    if (*keys == (void *) -1) {
      return NGX_CONF_OK;
    }

    hash.hash = types_hash;
    hash.key = NULL;
    hash.max_size = 2048;
    hash.bucket_size = 64;
    hash.name = "test_types_hash";
    hash.pool = cf->pool;
    hash.temp_pool = NULL;

    if (ngx_hash_init(&hash, (*keys)->elts, (*keys)->nelts) != NGX_OK) {
      return NGX_CONF_ERROR;
    }

    return NGX_CONF_OK;
  }

  if (prev_types_hash->buckets == NULL) {

    if (*prev_keys == NULL) {

      if (ngx_http_set_default_types(cf, prev_keys, default_types)
          != NGX_OK)
      {
        return NGX_CONF_ERROR;
      }

    } else if (*prev_keys == (void *) -1) {
      *keys = *prev_keys;
      return NGX_CONF_OK;
    }

    hash.hash = prev_types_hash;
    hash.key = NULL;
    hash.max_size = 2048;
    hash.bucket_size = 64;
    hash.name = "test_types_hash";
    hash.pool = cf->pool;
    hash.temp_pool = NULL;

    if (ngx_hash_init(&hash, (*prev_keys)->elts, (*prev_keys)->nelts)
        != NGX_OK)
    {
      return NGX_CONF_ERROR;
    }
  }

  *types_hash = *prev_types_hash;

  return NGX_CONF_OK;

}


ngx_int_t
ngx_http_set_default_types(ngx_conf_t *cf, ngx_array_t **types,
                           ngx_str_t *default_type)
{
  ngx_hash_key_t  *type;

  *types = ngx_array_create(cf->temp_pool, 1, sizeof(ngx_hash_key_t));
  if (*types == NULL) {
    return NGX_ERROR;
  }

  while (default_type->len) {

    type = ngx_array_push(*types);
    if (type == NULL) {
      return NGX_ERROR;
    }

    type->key = *default_type;
    type->key_hash = ngx_hash_key(default_type->data,
                                  default_type->len);
    type->value = (void *) 4;

    default_type++;
  }

  return NGX_OK;
}
